Gas-furnace.



No. 883,880. PATENTE D APR. 7, 1908. G. P. HENSLEY & F. H. BRYANT.

GAS FURNACE.

" APPLICATION FILED JULY 24, 1907.

4 WITNESSES f nslez nf W 5 M m F n" NORRIS PETERS cm, WASHINGTON, D c.

UNITED STATES PATENT OFFICE.

CALVIN P. HENSLEY AND FRANK H. BRYANT, OF SAN FRANCISCO, CALIFORNIA,ASSIGNORS TO NATIONAL FURNACE COMPANY, OF SAN FRANCISCO, CALIFORNIA, ACORPORATION OF CALIFORNIA.

T 0 all whom it may concern:

Be it known that we, CALVIN P. HENSLEY and FRANK H. BRYANT, bothcitizens of the United States, residing at the city and county of SanFrancisco and State of California, have invented new and usefulImprovements in Gas-Furnaces, of which the following is a specification.

Our invention relates to air heating furnaces and especially gasfurnaces. Its obj ect is to provide a furnace which will be eX- tremelycheap of construction, economical to install and to operate, and whichwill have a large heating capacity.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which. the figure is acentral vertical section of the furnace.

A represents an outer casing or shell made of sheet-metal, preferablybuilt up of suitable interlocked sections. Inside of this shell andspaced therefrom to provide an air passage 2 is a shell 3 which inclosesa combustion chamber 4. Inside this combustion chamber is disposed asuitable gas burner, as 5.

Fresh air is admitted to the passageway 2 through a suitable conduit 6,and air for purposes of combustion is admitted into the combustionchamber from the passageway 2 through suitable openings 7 near thebottom of the shell 3. Except as the air enters the furnace through theconduit 6, it is designed that the bottom of the furnace shall otherwisebe closed.

The bottom of the combustion chamber is adapted as a water reservoir 8,and which reservoir is open at the top to the heated space above and isconnected by a feed pipe 9 with a tank or water-containing receptacle10, disposed just outside the furnace. The pan 10 is kept suitablyfilled. and as the water in the pan 8 is depleted by evaporation, thepan 8 is replenished automatically from the tank 10.

The top of the shell 3 has a conical dome 11 with a central dischargeoutlet 12 into the hot air dome space 13 at the top of the furnace. Thedeflector, in the form of an inverted cone 14, is mounted above theoutlet 12, so as to distribute radially in all directions the heatrising from the burner 5.

Arranged a suitable distance above the Specification of Letters Patent.

Application filed July 24, 1907.

GAS-FURNACE.

Patented April '7, 1908.

Serial No. 385,238.

shell 3 and concentric with the conical top 11 of shell 3 is a deflector15 in the form of a frustum of a hollow cone, and carried by the casingA. The function of this deflector 15 is to direct the fresh air risingthrough the passageway 2 inwardly in counter-current to the conicalsheet of heated. gases rising from the combustion chamber anddistributed by the deflector 14. The arrangement of the deflectors l415with the contracted hot air opening 12 results in a thorough comminglingof the heat and of the cold air.

The combustion chamber being entirely air jacketed, and the deflector 15being connected with the outside casing only at its lower edge, directsthe cold air inwardly over the combustion chamber; and since the air cancirculate in beyond the deflector 15 there is practically little loss ofheat from the furnace by radiation.

In this construction separate air flues in the furnace are dispensedwith, and consequently a very large heating capacity results. The draftto the burners is carefully re ulated so that combustion is complete.

y mixing the hot particles with such a large supply of fresh airconstantly received into the furnace, no injurious effects result fromthe mixture of the hot particles and the hot air which is deliveredthrough the service pipes 16.

Having thus described our invention, What we claim and desire to secureby Letters Patent is 1. In a gas furnace, the combination of an outsidecylindrical shell, an inside shell concentric therewith and separatedtherefrom to inclose an air passageway, said inner shell inclosing acombustion chamber having draft inlets at the bottom opening into saidpasd sageway, and said combustion chamber having a contracted outletopening into the top of the furnace, a deflector arranged above saidinlet for radially distributing the heated particles rising from thecombustion chamher, and a deflector in the form of a frustum of a conesecured to the outer casing, and having its top terminating above theoutlet from the combustion chamber and arranged to direct the hot airrising in said passageway inwardly in counter-current to the heatpassing through said outlet from the combustion chamber, and a burner inthe combustion chamber.

2. In a gas furnace, the combination of an outside cylindrical'shell, aninside shell concentric therewith and separated therefrom to inclose anair passageway, said inner shell inclosing a combustion chamber havingdraft inlets at the bottom opening into said passageway, and saidcombustion chamber having a contracted outlet opening into the top ofthe furnace, a deflector arranged above said outletfor radiallydistributing the heated particles rising from the combustion chamber,and a deflector in the form of a frustum of a cone secured to the outercasing, and having its top terminating above the outlet from thecombustion chamber and arranged to direct the hot air rising in saidpassageway inwardly in counter-current to the heat passing through saidoutlet from the combustion chamber, a burner in the combustion chamber,said combustion chamber having an open top reservoir in its bot tom, andconnections between said reservoir and the outside source of supply.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

' CALVIN P. I-IENSLEY.

FRANK H. BRYANT. Witnesses HUGH D. NEILL, CI-IARLEs FRANoEE.

